Biosystems® Toxi Plus and Oxy Plus Detectors Dedicated to the continuous measurement of a single gas, the Toxi Plus is available for a variety of atmospheric hazards. One button controls all normal daily operations including automatic calibration adjustment. CO Plus sensor simultaneously measures both CO and H2S. Three easily changes AAA alkaline batteris provide months of continuous operation, and the rugged case is lightweight and compact enough to slip into a shirt pocket or clip onto a belt. Choose from display options that give just the right amount of information. The Toxi Plus Value Kit includes the Toxi Plus Detector, all standard accessories, a compact (15 or 34 liter) cylinder of calibration gas, 12-022 or 12-023 fixed flow regulator and a foam lined carrying case. UL listed.